Don't Spoil the Oil

Olive oil shares many of the characteristics of wine. Terroir, varietals, complexity of flavors, good and bad years depending on weather. Unlike most wines, however, olive oil does not improve with age.
Olives should be pressed within a day of harvest. Bottled oil should be stored in a cool, dark place and used within a year. A bottle, once opened, should be used as quickly as possible. In other words, don't save that fancy gift for "special" occasions. Use it up!
And don't sit a bottle, even unopened, in the sunlight for decoration. Most customers will probably think, how pretty! But not the real foodies. It will break their hearts.